Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/195397
Type: Artigo de periódico
Title: Evaluation Of The Antiulcerogenic Activity Of Violacein And Its Modulation By The Inclusion Complexation With Beta-cyclodextrin.
Author: Durán, Nelson
Justo, Giselle Z
Melo, Patrícia S
De Azevedo, Mariângela B M
Brito, Alba R M Souza
Almeida, Ana B A
Haun, Marcela
Abstract: The effects of beta-cyclodextrin (betaCD) inclusion complexation on the ability of violacein to prevent gastric ulceration in mice were studied. Violacein-betaCD inclusion complexes were prepared in 1:1 and 1:2 molar ratios and analysed by differential scanning calorimetry and powder X-ray diffractometry. Violacein previously administered orally at 10 mg/kg significantly reduced indomethacin-induced gastric lesions, as well as 100 mg/kg of cimetidine (positive control). However, betaCD complexation in both molar ratios significantly potentiated the protective action of violacein. In the HCl--ethanol-induced gastric ulcer model, violacein and the 1:2 inclusion complex (10 mg/kg, p.o.) inhibited gastric damage by almost 85%, whereas a 63% reduction was observed for the positive control, lansoprazole, at 30 mg/kg. In contrast, treatment with the 1:1 inclusion complex resulted in almost total disappearance of the antiulcer activity in this model. No significant changes in stress-induced gastric injury were found. In addition, the 1:2 inclusion complex improved the antilipoperoxidant activity of violacein in rat liver cells exposed to t-butyl hydroperoxide, whereas the 1:1 complex was less active than violacein. In summary, the 1:2 betaCD inclusion complex has gastroprotective properties similar to or higher than that of violacein. An increase in mucosal defensive mechanisms and protection against peroxidative damage might be involved.
Subject: Animals
Anti-ulcer Agents
Cells, Cultured
Chemistry, Pharmaceutical
Cimetidine
Cyclodextrins
Disease Models, Animal
Ethanol
Hepatocytes
Hydrochloric Acid
Indoles
Indomethacin
Lipid Peroxidation
Male
Malondialdehyde
Mice
Rats
Rats, Wistar
Stomach Ulcer
Stress, Physiological
Tert-butylhydroperoxide
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/12769230
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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